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Geometric distortion of the measured position of points lying 100 mm and 152.25 mm from isocenter during MLC motion. (a) Whisker plots for absolute deviation of points 100 mm and (b) 152.25 mm from isocenter. The horizontal line within each box marks the mean deviation, the edge of each box indicates the 25th and 75th percentiles, and the whiskers show the maximum and minimum of the data.
